.gitignore: ignore bad import records in test_data dir.
.gitignore: ignore bad import records in test_data dir.

Example file that this is ignoring:

/splice_machine_test/src/test/test-data/test_data/bad_import/_BAD_null_time.csv_-9019302658855395327

CompilerWorks/spliceengine,splicemachine/spliceengine,CompilerWorks/spliceengine,CompilerWorks/spliceengine,CompilerWorks/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,CompilerWorks/spliceengine,splicemachine/spliceengine,CompilerWorks/spliceengine